#include <fstream>

using namespace std;

ifstream cin("transport.in");
ofstream cout("transport.out");

int a, n;
int v[16010];

bool p(int l) {
    int cnt = 0, ok = 0;
    for (int i = 0; i < n; ++i) {
        if (v[i] > l) {
            return false;
        }
        if (cnt < v[i]) {
            cnt= l;
            ++ok;
        }
        cnt -= v[i];
        if (ok > a) {
            return false;
        }
    }

    return true;
}

int c() {
    int rest = 0, k = 1<<29;
    while (k!= 0) {
        if (!p(rest + k)) {
            rest += k;
        }
        k>>=1;
    }
    return rest;
}

int main()
{
    cin >> n >> a;
    for (int i = 0; i < n; ++i) {
        cin >> v[i];
    }
    cout << c() + 1;
    return 0;
}